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| PartNumber | DS1554W-120+ | DS1554W-120 | DS1554W-120IND+ |
| Description | Real Time Clock 256kB NV RAM Timekeeper | Real Time Clock | Real Time Clock 256kB NV RAM Timekeeper |
| Manufacturer | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Product Category | Real Time Clock | Real Time Clock | Real Time Clock |
| RoHS | Y | N | Y |
| Mounting Style | Through Hole | Through Hole | Through Hole |
| Package / Case | eDIP-32 | eDIP | eDIP-32 |
| RTC Bus Interface | Parallel | Parallel | Parallel |
| Time Format | HH:MM:SS | HH:MM:SS | HH:MM:SS |
| RTC Memory Size | 32768 B | 32768 B | 32768 B |
| Supply Voltage Max | 3.63 V | 3.63 V | 3.63 V |
| Supply Voltage Min | 2.97 V | 2.97 V | 2.97 V |
| Minimum Operating Temperature | 0 C | 0 C | - 40 C |
| Maximum Operating Temperature | + 70 C | + 70 C | + 85 C |
| Packaging | Tube | - | Tube |
| Function | Calendar, Clock, NV Timekeeping RAM, Watchdog Timekeeper | Calendar, Clock, NV Timekeeping RAM, Watchdog Timekeeper | Calendar, Clock, NV Timekeeping RAM, Watchdog Timekeeper |
| Product | Real Time Clocks | - | - |
| Series | DS1554W | DS1554W | DS1554W |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Product Type | Real Time Clock | Real Time Clocks | Real Time Clocks |
| Factory Pack Quantity | 12 | - | 11 |
| Subcategory | Clock & Timer ICs | Clock & Timer ICs | Clock & Timer ICs |
| Part # Aliases | 90-1554W+120 DS1554W | DS1554W | 90-1554W+12I DS1554W |